Improvement in rolled sheet-iron



aient @wird t `To all whomfit indy ccncewz':

` Letters Patent No.` 107,752, dated September 27, 1870.

sIfLAS'BARKERAND `HENRY sffraa'r'r, OFHARTFORD, coNNncTlfcUr.

.Viv

i p |MPROVE-MENT`IN-ROLLED SHEET-IRON.

V "The edulefrefered to in these Letters Patent and `making part of the same Be itknown that `w'efSILlis 4Banken and Halver S. PRATT, of Hartford, inthe county'of Hartford and Statcof Connecticut, have invented a ned/*Improve` ment in Rolled Sheet-Iron; and we flo-hereby declare the following, when taken' inconnection `with the acaccompanying drawingsand @the let-tersof reference marked thereon, to be a full, clear, and exact description of `the salue, `'andavhieh said drawings constitute apart of thisspeciiication; and'represent, in-

Figure 1, theconstruction ofthe rolls, and in Figure 2.acperspective`1view, very much enlarged,

l for the purpose of l clearlyillnstratng -myimprovement. i

. This invention relates `to anmprovenient in rolled sheet-iron, such. asis used for making stoves, and for other purposes. t i t t Y It is well-known that, in `cleaning or blackiug stoves made from commnsheet-iron, it isdiflcult to give j an even luster to" all parts`,"hence, as a general thing'.y

a material knownas Russia iron is substituted for the common American orEnglishiron.

' The `ohjectiofeour. invention is to prepare the sheet` iron so that abeautliful `.luster maybe given thereto bythe ordinary blackingzor `polishing process, and

also to give a'greater degreeof radiation to the same surface. To thistlend,

Our invention,consistsliin giving to the sheet-iron,

during the process of rolling, an indented surface, thus producinganimprovedarticle cfmanufaeture.

4We construct the rolls by cutting thesurface of one into any desirable iignre,regular or irregular, and-the other rollcut the reverse of the rst, sothat the projections upon one must correspond to the recesses of the other, and rice versa, as seen 1n fig.I l. Through the rolls thus constructed we pass the sheet-iron, after it has been reduced tothe proper thickness, by which operation the metal is indented, corresponding to the construction of the rolls, producing upon the metal Y `an uneven surface, as seen in iig. 2.4 The heavy lines denote longitudinal and transverse sections. The finer lines are drawn longitudinally and transversely through the depressions and over the raised portions.

The broken vlines denote the diagram ofthe plain sur -face of the sheet before operation, the raised portions and depressions alternating with each other, a heilig the center of the raised points, and fl the center of the depressions. This representation is increased in dimensions 'very greatly over the practical construction, but this is necessary in order ,to fully illustrate the invention.

VThis construction greatly facilitates the process of hlacking, inasmuch as the projecting points' receive a' high degree of luster, the brillianc'y of which is im'- parted to the other parts by reiicction, and such surface, as is well known, a'ords a much greater radiation than aismoothV polished surface like Russia iron.

`fe claim as our invention- As a new article of manufacture, sheet-iron, the' surfaces of which are indented,substantially n1 the mannerand for the purpose set forth.

' SILAS BARKER.

. HENRY S. PRATT.

Witnesses:

J OIIN SMITH, HENRY S. Baowa.` 

